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BQ27520EVM: Failing to obtain update status 01

Silvio Waldmann
Prodigy 20 points
Part Number: BQ27520EVM
Other Parts Discussed in Thread: BQSTUDIO, , GPCCHEM

Hello,

I have been trying to do the learning cycle on a Panasonic NCR18650B using the BQ27520EVM and bqstudio.

Following the several guides available I am unsure what can still be tried.

I am attaching the .gg File of how I am configuring the gauge. Using the ChemID 2012. It does say in the Database this is the Chemistry ID for my battery but the Description clearly says NiCoMn/carbon, although the battery is Li-Ion. Is this still the correct ChemID or should I run a Chem ID Identification?

After discharging the battery I send a Reset and an IT_Enable and wait for RUP_DIS and VOK bits to clear. Afterwards I start charging with 1.4 A until the Taper Current of 100 mA is reached and the FC bit gets set.

At this point I disconnect the charger and let the battery relax and expect the Update Status to change to "01" and update Qmax. But this never happens.

Do you have any suggestions as to why this update does not occur?

Best Regards

Silvio Waldmann

run4_1.log

battery_setting.gg.csv

  • 0
    TI__Guru* 76230 points

    Hi Silvio

    You are to send the IT and Reset command first before the onset of discharge. After discharge, you disconnect both the load and charge and then rest for 5 hours.

    Then charge to full, disconnect charger , rest 2 hours and discharge to empty , disconnect load and rest 5 hours

    For the choice of   chem id, i would recommend following the instructions of  our online tool gpcchem to determine the best chem id match for your device. Don't just go by the nomenclature of the cells

    Are you following the instructions listed in this document? It states step by step what you need to do.

    www.ti.com/.../slua902

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 20 points

    Thank you Onyx,

    The chem ID I found in the database is correct and I could achieve the update status without changing the pre defined Chem ID although the description seems to be erroneous.

    Following all the instructions I came to the conclusion that everything was satisfied and all the bits set correctly.

    The issue with my setup was a high Ohmic connection to my battery pack (~8Ohm) which led to a false voltage reading at the Gauge and thus less than 90% of the nominal capacity was being transferred into the battery, failing an update requirement.

    Also it was not necessary to send the IT enable before the initial discharge as it is sufficient to send the IT enable and Reset with an empty pack and waiting for RUP_DIS and VOK to clear.

    Best regards

    Silvio Waldmann